fdt: Use phandle to distinguish DT nodes with same name

commit c589132a1d upstream.

While assigning the sequence number to subsystem instances by reading the
aliases property, only DT nodes names are compared and not the complete
path. This causes a problem when there are two DT nodes with same name but
have different paths.

In arch/arm/dts/k3-am65-main.dtsi there are two USB controllers with the
same device tree node name but different path. When aliases are defined for
these USB controllers then fdtdec_get_alias_seq() fails to pick the correct
instance for a given index.

fdt_path_offset() function is slow and this would effect the U-Boot
startup. To avert the time penalty on all boards, apply this extra check
only when required by using a config option.

Fix it by comparing the phandles of DT nodes after the node names match,
under a config option.

Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Fix whitespace error in Kconfig:
Signed-off-by: Simon Glass <sjg@chromium.org>

lib/Kconfig

@@ -699,3 +699,11 @@ config LIB_ELF
 	  This supports fir 32 bit and 64 bit versions.
 
 endmenu
+
+config PHANDLE_CHECK_SEQ
+	bool "Enable phandle check while getting sequence number"
+	default n
+	help
+	  When there are multiple device tree nodes with same name,
+          enable this config option to distinguish them using
+	  phandles in fdtdec_get_alias_seq() function.

lib/fdtdec.c

@@ -500,6 +500,17 @@ int fdtdec_get_alias_seq(const void *blob, const char *base, int offset,
 		slash = strrchr(prop, '/');
 		if (strcmp(slash + 1, find_name))
 			continue;
+
+		/*
+		 * Adding an extra check to distinguish DT nodes with
+		 * same name
+		 */
+		if (IS_ENABLED(CONFIG_PHANDLE_CHECK_SEQ)) {
+			if (fdt_get_phandle(blob, offset) !=
+			    fdt_get_phandle(blob, fdt_path_offset(blob, prop)))
+				continue;
+		}
+
 		val = trailing_strtol(name);
 		if (val != -1) {
 			*seqp = val;